# US 10,110,432 B2 · Telecommunications system for programmable logic controller > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,110,432 B2 - Document ID: US10110432B2 - Status: Granted - Kind: B2 - Application number: 15/350,302 - Filed: 2016-11-14 - Published: 2017-10-05 - Granted: 2018-10-23 - Earliest claimed: 2016-04-05 - Assignees: Lsis Co., Ltd. - Applicants: Lsis Co., Ltd. - Inventors: Jae-Il Kwon - Web page: https://patentgrep.com/patent/US10110432B2 ## CPC - H04L 41/0806: for initial configuration or provisioning, e.g. plug-and-play - G05B 19/058: {Safety, monitoring} - H04L 1/20: using signal quality detector - H04L 67/10: in which an application is distributed across nodes in the network (software deployment G06F8/60; multiprogramming arrangements G06F9/46) - G01R 19/1659: {to indicate that the value is within or outside a predetermined range of values (window) (G01R19/16514, G01R19/16519, G01R19/16528 and G01R19/16533 take precedence)} - G05B 9/02: electric - G05B 19/052: {Linking several PLC's} - G05B 2219/15026: Detection of data transmission faults - G06F 11/00: Error detection; Error correction; Monitoring (error detection, correction or monitoring in information storage based on relative movement between record carrier and transducer G11B20/18; monitoring, i.e. supervising the progress of recording or reproducing G11B27/36; in static stores G11C29/00) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G) - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A telecommunications system for a programmable logic controller (PLC) includes: a master module comprising a transmitter and a receiver; one or more slave modules configured to receive signals transmitted from the transmitter and transmit signals to the receiver in response to the transmitted signals; a signal conversion module configured to convert the signals transmitted between the master module and the slave modules into digital signals; a control module configured to control the signal conversion module and to determine whether there is an error in the signals transmitted between the master module and the slave modules based on the digital signals; a display module configured to display a result of the determination by the control module. ## Claims ### Claim 1 A telecommunications system disposed in a programmable logic controller (PLC), comprising: a master device comprising a transmitter and a receiver; one or more slave devices, wherein the master device is connected to a communication line, the transmitter is configured to transmit a signal through the communication line to the one or more slave modules, and the receiver is configured to receive a response signal through the communication line from the one or more slave modules; a signal conversion device connected to the communication line and configured to convert the signal and the response signal transmitted or received between the master device and the one or more slave devices into digital signals; and a control device configured to control the master device and the signal conversion device and to determine whether there is an error in the signal and the response signal based on the digital signals transmitted from the signal conversion module, wherein the control device determines that the error is resulted from a fault in the communication line if a maximum value of the digital signals is below a high-value voltage value and a minimum value of the digital signals is above a low-level voltage value. ### Claim 2 (depends on 1) The telecommunications system of claim 1, wherein the control device determines that the error is resulted from a noise fault if the maximum value of the digital signals is above the high-value voltage value and the minimum value of the digital signals is below the low-level voltage value. ### Claim 3 (depends on 1) The telecommunications system of claim 1, wherein the control device determines that the error is resulted from a fault in a terminating resistor if there is a distortion waveform in the digital signals. ### Claim 4 (depends on 1) The telecommunications system of claim 1, further comprising: a display device configured to display a result of the determination by the control device. ### Claim 5 (depends on 4) The telecommunications system of claim 4, wherein the display device displays a type of the error in the transmitted signal as at least one of a noise fault, a fault in the communications line and a fault in a terminating line as determined by the control device. ### Claim 6 A communications method used in a communications system disposed in a programmable logic controller (PLC), comprising: selecting a station number of a slave device; transmitting first data to the selected slave device; converting the transmitted first data into a first signal to determine whether the first signal is normal; receiving second data from the slave device; converting the received second data into a second signal to determine whether the received second signal is normal, determining whether an acknowledgement signal is normal if it is determined that the received second signal is normal, ending communications if it is determined that the acknowledgement signal is normal; and determining that there is an error and ending communications if it is determined that the acknowledgement signal is not normal. ### Claim 7 (depends on 6) The method of claim 6, further comprising: determining that there is an error and ending communications if it is determined that the received second signal is not normal.